SYNTHESIS AND ANTIOXIDANT EVALUATION OF NOVEL PHENOTHIAZINE LINKED SUBSTITUTEDBENZYLIDENEAMINO-1,2,4-TRIAZOLE DERIVATIVES

Abstract

ABSTRACT A series of novel 5-((10 H -phenothiazin-10yl)methyl)-4-(substitutedbenzylideneamino)-4 H -1,2,4-triazole-3-thiol derivatives (6a-i) have been synthesized from compound (1) through a multi-step reaction. The key intermediate (5) afforded a series of title compounds (6a–i) on condensation with various suitable aldehydes in the presence of H 2 SO 4 . The structures of novel compounds were characterized based on their elemental analysis, IR, 1 H-NMR, 13 C-NMR and MS spectral data. All these novel compounds were screened for their in vitro antioxidant activity by employing nitric oxide, hydrogen peroxide, and DPPH radical scavenging assays. The compounds 6d, 6e and 6i demonstrated potent antioxidant activity as these contain the electron-releasing groups. Keywords: Synthesis, Anti-oxidant activity, 1,2,4-Triazole, Phenothiazines. INTRODUCTION The heterocyclic compounds chemistry continues to be an emerging field in the organic and pharmaceutical chemistry 1 . Heterocyclic compounds are present in various drugs, several natural products, some vitamins, biomolecules, and biologically active compounds such as anti-inflammatory, antitumour, antimalarial, antidepressant, anti-HIV, antibiotic and antimicrobial agents etc